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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Rapid Accurate Evaluation of Prestress
Author(s): A Ghali and W. H. Dilger
Publication: Journal Proceedings
Appears on pages(s): 759-763
Keywords: computer programs; creep properties; prestress
loss; prestressed concrete; shrinkage; stresses; structural
analysis; structural design.
Abstract:The difficulty in estimating accurately the losses due to creep, shrinkage, and relaxation of steel lies in: (a) prediction of coefficients related to the quality of concrete, steel, and the environment in which the structure will be like during the period of loss, (b) the interdependence of the amount of prestress loss produced by the three contributory causes. In practice the designer may recourse to result of tests or to recommended practice for values of cr eep shrinkage, and relaxation. Once these values are established the errors resulting from Item (b) above should be eliminated. This paper is written for this purpose. Using step-by-step procedure which accounts for elastic and creep recoveries of concrete and the effect of variation in stress level on the relaxation of steel, graphs are prepared for use in practice. The use of these allows economical design by accurate estimate of the loss in prestress without the necessity of performing the computations of the step-by-step procedure
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